Korrasami, The Vampire Babysitter

Korra got poisoned by Zaheer which almost killed her but her parents were able to find a certain medicine that saved her and helps her. If she doesnt get the medicine she will die, Korra was forced to move with her Parents at the Southern Water Tribe. 6 months later Korra's mom, Senna and her dad, Tonraq have to go to the Northern Water Tribe to get more medicine for Korra because she is almost out but it takes months. They called Asami and asked if she can come up and stay for a couple of months to watch Korra and make sure she's okay. But Asami isn't who you think she is....